R9 270X Fragmenting

[Scafe07]

Hello  Everyone,

 

Hoping someone can help me out here. I just received a Sapphire Dual-X R9 270X 2G D5 for free from a friend. I know this is an old card but it is better than what I previously had. I put it in my Gateway FX6800-09 and booted up the system. The system is bone stock other than now has 12 gb of RAM.

 

The card has no issues and runs completely fine on benchmarks (Unigine Heaven) and games such as Fortnite other than randomly has huge frame drops from like 60 fps down to 10-15 for very short periods. I troubleshot this and determined if I increase the power limit by 10-20% the issue goes away. So then I decided to fire up afterburner and see how much the card really has regarding overclocking. But whenever I change the core clock or memory clock I instantly have massive fragments all over the monitor even if there is no stress on the gpu. That being said I can fire up the benchmark and after 5 or so seconds the fragmenting stops and the benchmark runs fairly smoothly. However when I close the benchmark the fragmenting resumes. 

 

So I figured maybe the card had no headroom and I tried to under clock by 10 or 20 MHz. To my surprise the same thing happens on the under clock as the over clock. The card seems to be very unstable and will crash eventually. Does anyone know what would be the cause of this while it runs super smoothly at stock speeds. 

 

Also them temperature under load after 20 minutes is around 75 C.

 

Thanks

[aezakmi]

what do you mean by fragments? artifacts like these

or these?

or something else?

 

there are different kind of artifacts but those are the most common, it could be a corrupted GPU or simply interference in the output

[Scafe07]

More like the second one. It is horizontal lines across the screen covering 40% of the screen.  All random colours. And I thought that too but why when I run stock speeds is there no fragmenting. 

 

Edit: I added a picture to show the issue. This is when I change the core clock from 1070 to 1060. This is not the best example but it just flashes quickly then stops for a bit until it happens again

 

Edited January 14, 2019 by Scafe07
Added photo to show problem